Résumé
This article presents Propa-L, a freely accessible Web service that allows to semantically filter a lexical network. The language resources behind the service are dynamic and created through Games With A Purpose. We show an example of application of this service: the generation of a list of keywords for parental filtering on the Web, but many others can be envisaged. Moreover, the propagation algorithm we present here can be applied to any lexical network, in any language.